Refactor regions spec to not hard-code atypical regions

The regions spec has a hard-coded list of "atypical regions" which
really just means regions which exist but are not available to us via
the aws-sdk `describe_regions` API call.

It would be simpler to just check that all of the regions that we do
have access to are in the regions list.  This would allow us to update
the `config/regions.yml` list in an automated way.

spec/models/manageiq/providers/amazon/regions_spec.rb

@@ -5,36 +5,23 @@
     # https://github.com/aws/aws-sdk-ruby/blob/5fe5795e8910bb667996dfc75e4f16b7e69e3980/gems/aws-partitions/partitions.json#L11
     ordinary_regions_regexp = /^(us|eu|ap|sa|ca)\-\w+\-\d+$/
 
-    # https://docs.aws.amazon.com/general/latest/gr/rande.html - see quotes below
-    atypical_regions = [
-      'ap-east-1',      # "you must manually enable before you can use..."
-      'ap-south-2',
-      'ap-southeast-3',
-      'ap-southeast-4',
-      'eu-central-2',
-      'eu-south-1',
-      'eu-south-2'
-    ]
-
     current_regions = described_class.regions.reject do |name, _config|
-      atypical_regions.include?(name) || name !~ ordinary_regions_regexp
+      name !~ ordinary_regions_regexp
     end.map do |_name, config|
       {:region_name => config[:name], :endpoint => config[:hostname]}
     end
 
     online_regions = VCR.use_cassette(described_class.name.underscore) do
-      ems.connect.client.describe_regions.to_h[:regions]
+      ems.connect.client.describe_regions.to_h[:regions].map { |r| r.slice(:region_name, :endpoint) }
     end
 
-    online_regions.each { |r| r.delete(:opt_in_status) }
-
     # sort for better diff
     [current_regions, online_regions].each do |regions|
       regions.map!     { |r| r.sort.to_h     }
       regions.sort_by! { |r| r[:region_name] }
     end
 
-    expect(online_regions).to eq(current_regions)
+    expect(current_regions).to include(*online_regions)
   end
 
   context "disable regions via Settings" do